572 lines
17 KiB
C
572 lines
17 KiB
C
/* Copyright (C) 2005-2015 Free Software Foundation, Inc.
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Contributed by Richard Henderson <rth@redhat.com>.
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This file is part of the GNU OpenMP Library (libgomp).
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Libgomp is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* This file handles the LOOP (FOR/DO) construct. */
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#include <limits.h>
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#include <stdlib.h>
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#include "libgomp.h"
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typedef unsigned long long gomp_ull;
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/* Initialize the given work share construct from the given arguments. */
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static inline void
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gomp_loop_ull_init (struct gomp_work_share *ws, bool up, gomp_ull start,
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gomp_ull end, gomp_ull incr, enum gomp_schedule_type sched,
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gomp_ull chunk_size)
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{
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ws->sched = sched;
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ws->chunk_size_ull = chunk_size;
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/* Canonicalize loops that have zero iterations to ->next == ->end. */
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ws->end_ull = ((up && start > end) || (!up && start < end))
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? start : end;
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ws->incr_ull = incr;
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ws->next_ull = start;
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ws->mode = 0;
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if (sched == GFS_DYNAMIC)
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{
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ws->chunk_size_ull *= incr;
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#if defined HAVE_SYNC_BUILTINS && defined __LP64__
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{
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/* For dynamic scheduling prepare things to make each iteration
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faster. */
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struct gomp_thread *thr = gomp_thread ();
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struct gomp_team *team = thr->ts.team;
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long nthreads = team ? team->nthreads : 1;
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if (__builtin_expect (up, 1))
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{
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/* Cheap overflow protection. */
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if (__builtin_expect ((nthreads | ws->chunk_size_ull)
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< 1ULL << (sizeof (gomp_ull)
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* __CHAR_BIT__ / 2 - 1), 1))
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ws->mode = ws->end_ull < (__LONG_LONG_MAX__ * 2ULL + 1
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- (nthreads + 1) * ws->chunk_size_ull);
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}
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/* Cheap overflow protection. */
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else if (__builtin_expect ((nthreads | -ws->chunk_size_ull)
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< 1ULL << (sizeof (gomp_ull)
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* __CHAR_BIT__ / 2 - 1), 1))
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ws->mode = ws->end_ull > ((nthreads + 1) * -ws->chunk_size_ull
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- (__LONG_LONG_MAX__ * 2ULL + 1));
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}
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#endif
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}
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if (!up)
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ws->mode |= 2;
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}
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/* The *_start routines are called when first encountering a loop construct
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that is not bound directly to a parallel construct. The first thread
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that arrives will create the work-share construct; subsequent threads
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will see the construct exists and allocate work from it.
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START, END, INCR are the bounds of the loop; due to the restrictions of
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OpenMP, these values must be the same in every thread. This is not
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verified (nor is it entirely verifiable, since START is not necessarily
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retained intact in the work-share data structure). CHUNK_SIZE is the
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scheduling parameter; again this must be identical in all threads.
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Returns true if there's any work for this thread to perform. If so,
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*ISTART and *IEND are filled with the bounds of the iteration block
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allocated to this thread. Returns false if all work was assigned to
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other threads prior to this thread's arrival. */
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static bool
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gomp_loop_ull_static_start (bool up, gomp_ull start, gomp_ull end,
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gomp_ull incr, gomp_ull chunk_size,
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gomp_ull *istart, gomp_ull *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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thr->ts.static_trip = 0;
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if (gomp_work_share_start (false))
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{
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gomp_loop_ull_init (thr->ts.work_share, up, start, end, incr,
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GFS_STATIC, chunk_size);
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gomp_work_share_init_done ();
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}
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return !gomp_iter_ull_static_next (istart, iend);
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}
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static bool
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gomp_loop_ull_dynamic_start (bool up, gomp_ull start, gomp_ull end,
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gomp_ull incr, gomp_ull chunk_size,
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gomp_ull *istart, gomp_ull *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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bool ret;
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if (gomp_work_share_start (false))
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{
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gomp_loop_ull_init (thr->ts.work_share, up, start, end, incr,
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GFS_DYNAMIC, chunk_size);
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gomp_work_share_init_done ();
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}
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#if defined HAVE_SYNC_BUILTINS && defined __LP64__
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ret = gomp_iter_ull_dynamic_next (istart, iend);
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#else
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gomp_mutex_lock (&thr->ts.work_share->lock);
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ret = gomp_iter_ull_dynamic_next_locked (istart, iend);
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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#endif
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return ret;
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}
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static bool
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gomp_loop_ull_guided_start (bool up, gomp_ull start, gomp_ull end,
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gomp_ull incr, gomp_ull chunk_size,
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gomp_ull *istart, gomp_ull *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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bool ret;
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if (gomp_work_share_start (false))
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{
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gomp_loop_ull_init (thr->ts.work_share, up, start, end, incr,
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GFS_GUIDED, chunk_size);
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gomp_work_share_init_done ();
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}
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#if defined HAVE_SYNC_BUILTINS && defined __LP64__
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ret = gomp_iter_ull_guided_next (istart, iend);
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#else
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gomp_mutex_lock (&thr->ts.work_share->lock);
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ret = gomp_iter_ull_guided_next_locked (istart, iend);
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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#endif
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return ret;
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}
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bool
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GOMP_loop_ull_runtime_start (bool up, gomp_ull start, gomp_ull end,
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gomp_ull incr, gomp_ull *istart, gomp_ull *iend)
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{
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struct gomp_task_icv *icv = gomp_icv (false);
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switch (icv->run_sched_var)
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{
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case GFS_STATIC:
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return gomp_loop_ull_static_start (up, start, end, incr,
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icv->run_sched_modifier,
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istart, iend);
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case GFS_DYNAMIC:
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return gomp_loop_ull_dynamic_start (up, start, end, incr,
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icv->run_sched_modifier,
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istart, iend);
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case GFS_GUIDED:
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return gomp_loop_ull_guided_start (up, start, end, incr,
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icv->run_sched_modifier,
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istart, iend);
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case GFS_AUTO:
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/* For now map to schedule(static), later on we could play with feedback
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driven choice. */
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return gomp_loop_ull_static_start (up, start, end, incr,
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0, istart, iend);
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default:
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abort ();
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}
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}
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/* The *_ordered_*_start routines are similar. The only difference is that
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this work-share construct is initialized to expect an ORDERED section. */
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static bool
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gomp_loop_ull_ordered_static_start (bool up, gomp_ull start, gomp_ull end,
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gomp_ull incr, gomp_ull chunk_size,
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gomp_ull *istart, gomp_ull *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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thr->ts.static_trip = 0;
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if (gomp_work_share_start (true))
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{
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gomp_loop_ull_init (thr->ts.work_share, up, start, end, incr,
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GFS_STATIC, chunk_size);
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gomp_ordered_static_init ();
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gomp_work_share_init_done ();
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}
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return !gomp_iter_ull_static_next (istart, iend);
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}
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static bool
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gomp_loop_ull_ordered_dynamic_start (bool up, gomp_ull start, gomp_ull end,
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gomp_ull incr, gomp_ull chunk_size,
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gomp_ull *istart, gomp_ull *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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bool ret;
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if (gomp_work_share_start (true))
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{
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gomp_loop_ull_init (thr->ts.work_share, up, start, end, incr,
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GFS_DYNAMIC, chunk_size);
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gomp_mutex_lock (&thr->ts.work_share->lock);
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gomp_work_share_init_done ();
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}
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else
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gomp_mutex_lock (&thr->ts.work_share->lock);
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ret = gomp_iter_ull_dynamic_next_locked (istart, iend);
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if (ret)
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gomp_ordered_first ();
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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return ret;
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}
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static bool
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gomp_loop_ull_ordered_guided_start (bool up, gomp_ull start, gomp_ull end,
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gomp_ull incr, gomp_ull chunk_size,
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gomp_ull *istart, gomp_ull *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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bool ret;
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if (gomp_work_share_start (true))
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{
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gomp_loop_ull_init (thr->ts.work_share, up, start, end, incr,
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GFS_GUIDED, chunk_size);
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gomp_mutex_lock (&thr->ts.work_share->lock);
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gomp_work_share_init_done ();
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}
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else
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gomp_mutex_lock (&thr->ts.work_share->lock);
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ret = gomp_iter_ull_guided_next_locked (istart, iend);
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if (ret)
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gomp_ordered_first ();
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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return ret;
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}
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bool
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GOMP_loop_ull_ordered_runtime_start (bool up, gomp_ull start, gomp_ull end,
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gomp_ull incr, gomp_ull *istart,
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gomp_ull *iend)
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{
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struct gomp_task_icv *icv = gomp_icv (false);
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switch (icv->run_sched_var)
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{
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case GFS_STATIC:
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return gomp_loop_ull_ordered_static_start (up, start, end, incr,
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icv->run_sched_modifier,
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istart, iend);
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case GFS_DYNAMIC:
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return gomp_loop_ull_ordered_dynamic_start (up, start, end, incr,
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icv->run_sched_modifier,
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istart, iend);
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case GFS_GUIDED:
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return gomp_loop_ull_ordered_guided_start (up, start, end, incr,
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icv->run_sched_modifier,
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istart, iend);
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case GFS_AUTO:
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/* For now map to schedule(static), later on we could play with feedback
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driven choice. */
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return gomp_loop_ull_ordered_static_start (up, start, end, incr,
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0, istart, iend);
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default:
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abort ();
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}
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}
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/* The *_next routines are called when the thread completes processing of
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the iteration block currently assigned to it. If the work-share
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construct is bound directly to a parallel construct, then the iteration
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bounds may have been set up before the parallel. In which case, this
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may be the first iteration for the thread.
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Returns true if there is work remaining to be performed; *ISTART and
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*IEND are filled with a new iteration block. Returns false if all work
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has been assigned. */
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static bool
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gomp_loop_ull_static_next (gomp_ull *istart, gomp_ull *iend)
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{
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return !gomp_iter_ull_static_next (istart, iend);
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}
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static bool
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gomp_loop_ull_dynamic_next (gomp_ull *istart, gomp_ull *iend)
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{
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bool ret;
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#if defined HAVE_SYNC_BUILTINS && defined __LP64__
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ret = gomp_iter_ull_dynamic_next (istart, iend);
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#else
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struct gomp_thread *thr = gomp_thread ();
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gomp_mutex_lock (&thr->ts.work_share->lock);
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ret = gomp_iter_ull_dynamic_next_locked (istart, iend);
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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#endif
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return ret;
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}
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static bool
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gomp_loop_ull_guided_next (gomp_ull *istart, gomp_ull *iend)
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{
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bool ret;
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#if defined HAVE_SYNC_BUILTINS && defined __LP64__
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ret = gomp_iter_ull_guided_next (istart, iend);
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#else
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struct gomp_thread *thr = gomp_thread ();
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gomp_mutex_lock (&thr->ts.work_share->lock);
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ret = gomp_iter_ull_guided_next_locked (istart, iend);
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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#endif
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return ret;
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}
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bool
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GOMP_loop_ull_runtime_next (gomp_ull *istart, gomp_ull *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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switch (thr->ts.work_share->sched)
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{
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case GFS_STATIC:
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case GFS_AUTO:
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return gomp_loop_ull_static_next (istart, iend);
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case GFS_DYNAMIC:
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return gomp_loop_ull_dynamic_next (istart, iend);
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case GFS_GUIDED:
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return gomp_loop_ull_guided_next (istart, iend);
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default:
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abort ();
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}
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}
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/* The *_ordered_*_next routines are called when the thread completes
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processing of the iteration block currently assigned to it.
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Returns true if there is work remaining to be performed; *ISTART and
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*IEND are filled with a new iteration block. Returns false if all work
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has been assigned. */
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static bool
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gomp_loop_ull_ordered_static_next (gomp_ull *istart, gomp_ull *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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int test;
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gomp_ordered_sync ();
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gomp_mutex_lock (&thr->ts.work_share->lock);
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test = gomp_iter_ull_static_next (istart, iend);
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if (test >= 0)
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gomp_ordered_static_next ();
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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return test == 0;
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}
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static bool
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gomp_loop_ull_ordered_dynamic_next (gomp_ull *istart, gomp_ull *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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bool ret;
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gomp_ordered_sync ();
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gomp_mutex_lock (&thr->ts.work_share->lock);
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ret = gomp_iter_ull_dynamic_next_locked (istart, iend);
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if (ret)
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gomp_ordered_next ();
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else
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gomp_ordered_last ();
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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return ret;
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}
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static bool
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gomp_loop_ull_ordered_guided_next (gomp_ull *istart, gomp_ull *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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bool ret;
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gomp_ordered_sync ();
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gomp_mutex_lock (&thr->ts.work_share->lock);
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ret = gomp_iter_ull_guided_next_locked (istart, iend);
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if (ret)
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gomp_ordered_next ();
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else
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gomp_ordered_last ();
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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return ret;
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}
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bool
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GOMP_loop_ull_ordered_runtime_next (gomp_ull *istart, gomp_ull *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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switch (thr->ts.work_share->sched)
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{
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case GFS_STATIC:
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case GFS_AUTO:
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return gomp_loop_ull_ordered_static_next (istart, iend);
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case GFS_DYNAMIC:
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return gomp_loop_ull_ordered_dynamic_next (istart, iend);
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case GFS_GUIDED:
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return gomp_loop_ull_ordered_guided_next (istart, iend);
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default:
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abort ();
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}
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}
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/* We use static functions above so that we're sure that the "runtime"
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function can defer to the proper routine without interposition. We
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export the static function with a strong alias when possible, or with
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a wrapper function otherwise. */
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#ifdef HAVE_ATTRIBUTE_ALIAS
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extern __typeof(gomp_loop_ull_static_start) GOMP_loop_ull_static_start
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__attribute__((alias ("gomp_loop_ull_static_start")));
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extern __typeof(gomp_loop_ull_dynamic_start) GOMP_loop_ull_dynamic_start
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__attribute__((alias ("gomp_loop_ull_dynamic_start")));
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extern __typeof(gomp_loop_ull_guided_start) GOMP_loop_ull_guided_start
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__attribute__((alias ("gomp_loop_ull_guided_start")));
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extern __typeof(gomp_loop_ull_ordered_static_start) GOMP_loop_ull_ordered_static_start
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__attribute__((alias ("gomp_loop_ull_ordered_static_start")));
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extern __typeof(gomp_loop_ull_ordered_dynamic_start) GOMP_loop_ull_ordered_dynamic_start
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__attribute__((alias ("gomp_loop_ull_ordered_dynamic_start")));
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extern __typeof(gomp_loop_ull_ordered_guided_start) GOMP_loop_ull_ordered_guided_start
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__attribute__((alias ("gomp_loop_ull_ordered_guided_start")));
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extern __typeof(gomp_loop_ull_static_next) GOMP_loop_ull_static_next
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__attribute__((alias ("gomp_loop_ull_static_next")));
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extern __typeof(gomp_loop_ull_dynamic_next) GOMP_loop_ull_dynamic_next
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__attribute__((alias ("gomp_loop_ull_dynamic_next")));
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extern __typeof(gomp_loop_ull_guided_next) GOMP_loop_ull_guided_next
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__attribute__((alias ("gomp_loop_ull_guided_next")));
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extern __typeof(gomp_loop_ull_ordered_static_next) GOMP_loop_ull_ordered_static_next
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__attribute__((alias ("gomp_loop_ull_ordered_static_next")));
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extern __typeof(gomp_loop_ull_ordered_dynamic_next) GOMP_loop_ull_ordered_dynamic_next
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__attribute__((alias ("gomp_loop_ull_ordered_dynamic_next")));
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extern __typeof(gomp_loop_ull_ordered_guided_next) GOMP_loop_ull_ordered_guided_next
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__attribute__((alias ("gomp_loop_ull_ordered_guided_next")));
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#else
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bool
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GOMP_loop_ull_static_start (bool up, gomp_ull start, gomp_ull end,
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gomp_ull incr, gomp_ull chunk_size,
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gomp_ull *istart, gomp_ull *iend)
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{
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return gomp_loop_ull_static_start (up, start, end, incr, chunk_size, istart,
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iend);
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}
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bool
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GOMP_loop_ull_dynamic_start (bool up, gomp_ull start, gomp_ull end,
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gomp_ull incr, gomp_ull chunk_size,
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gomp_ull *istart, gomp_ull *iend)
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{
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return gomp_loop_ull_dynamic_start (up, start, end, incr, chunk_size, istart,
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iend);
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}
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bool
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GOMP_loop_ull_guided_start (bool up, gomp_ull start, gomp_ull end,
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gomp_ull incr, gomp_ull chunk_size,
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gomp_ull *istart, gomp_ull *iend)
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{
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return gomp_loop_ull_guided_start (up, start, end, incr, chunk_size, istart,
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iend);
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}
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bool
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GOMP_loop_ull_ordered_static_start (bool up, gomp_ull start, gomp_ull end,
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gomp_ull incr, gomp_ull chunk_size,
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gomp_ull *istart, gomp_ull *iend)
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{
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return gomp_loop_ull_ordered_static_start (up, start, end, incr, chunk_size,
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istart, iend);
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}
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bool
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GOMP_loop_ull_ordered_dynamic_start (bool up, gomp_ull start, gomp_ull end,
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gomp_ull incr, gomp_ull chunk_size,
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gomp_ull *istart, gomp_ull *iend)
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{
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return gomp_loop_ull_ordered_dynamic_start (up, start, end, incr, chunk_size,
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istart, iend);
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}
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bool
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GOMP_loop_ull_ordered_guided_start (bool up, gomp_ull start, gomp_ull end,
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gomp_ull incr, gomp_ull chunk_size,
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gomp_ull *istart, gomp_ull *iend)
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{
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return gomp_loop_ull_ordered_guided_start (up, start, end, incr, chunk_size,
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istart, iend);
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}
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bool
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GOMP_loop_ull_static_next (gomp_ull *istart, gomp_ull *iend)
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{
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return gomp_loop_ull_static_next (istart, iend);
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}
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bool
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GOMP_loop_ull_dynamic_next (gomp_ull *istart, gomp_ull *iend)
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{
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return gomp_loop_ull_dynamic_next (istart, iend);
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}
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bool
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GOMP_loop_ull_guided_next (gomp_ull *istart, gomp_ull *iend)
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{
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return gomp_loop_ull_guided_next (istart, iend);
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}
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bool
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GOMP_loop_ull_ordered_static_next (gomp_ull *istart, gomp_ull *iend)
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{
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return gomp_loop_ull_ordered_static_next (istart, iend);
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}
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bool
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GOMP_loop_ull_ordered_dynamic_next (gomp_ull *istart, gomp_ull *iend)
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{
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return gomp_loop_ull_ordered_dynamic_next (istart, iend);
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}
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bool
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GOMP_loop_ull_ordered_guided_next (gomp_ull *istart, gomp_ull *iend)
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{
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return gomp_loop_ull_ordered_guided_next (istart, iend);
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}
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#endif
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